Protection means for soot-blowing elements



July 9, 1929. D. s; JACQBUS PROTECTION MEANS FOR SOOT BLOWING ELEMENTS Filed 001;. 15. 1920 s Sheets-Shed 1 &

July 9, 1929. D, 5, JACOBUS I 1.719.934

PROTECTION mums FOR SOOT BLOWING ELEMENTS Filed OCt- 15. 1920 3 Sheets-Sheet 2 Ir BY a :1

WI V EYS.

July 9, 1929. JACQBUS 1.719.934

PROTECTION MEANS FOR SOOT BLOWING ELEMENTS Filed Oct. 15. 1920 3 Sheets-Sheet 5 LE I INV NTOR.

8y v/dtw 4 ATTORNEYS.

Patented July 9, 1929.

UNITED STATES PAJTENTT- OFFICE.

DAVID S. JAGOBUS, OF JERSEY CITY, NEW JERSEY. AEJSIGNOR TO TIE-IE BABGOGK & WILGOX COMPANY, OF BAYONNE, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

PROTECTION MEANS FOR SQOT -BILOW'ING ELEMENTS.

Application filed October 15,1920. sem is. 417,194.

Soot-blowing elements, as is well known, are commonly used for removing deposit which accumulates on the boiler tubes of steam boilers. The ditliculty has been experienced, however, that such elements have a comparatively short life, as it is necessary to install them where they are subjected to intense heat with consequent injury to the elements.

The object of my present invention is the provision of means for cooling the soot blowing elements. and thereby greatly increasing the life thereof.

My invention will best be understood by reference to the accompanying drawings, in which like reference characters indicate like parts, and in which Figure 1 is a vertical sectional elevation of a steam boilerembodying my invention; Fig. 2 is a fragmentary section illustrating, on a larger scale than Fig. 1, theposition of the soot-blow1ng element with reference to the associated parts; Fig. 3 is a sectional elevation taken at right-angles to Fig. 2; Fig. 4- is an enlarged sectional view, similar to Fig. 2, but showing a modified form of my invention; Fig. 5 is a vertical sectional elevation taken through Fig. 4E and at-right-angles thereto; 6 is a sectional view similar to Fig. 2, but showing still another modified form of my invention; Fig. 7 is a section taken along the line 77 o'lf Fig. 6, and Fig. 8 is a per spective view of one of the removable blocks which, with the remainder of the protecting member, surrounds the soot-blowing element.

Referring, now, to the drawings, 10 are the inclined water tubes of a steam boiler in which I have illustrated my invention, the tubes preferably being divided into an upper bank 10 and a lower bank 10 the two banks being spaced apart to form a secondary combustion chamber 11 therebetween. The ends of the boiler tubes are connected to uptakeand downtake headers 12 and 13, respectively, the uptake headers being connected by tubes 14 and 15 to the steam and water drum 16, while the downtake header 13 is connected to the drum by tubes 17. In the boiler here shown, the upper bank 10 of tubes is divided into two banks, somewhat spaced apart, the two headers to which the respective banks are connected being nippled together at 18. p The boiler tubes are located above the primary combustion chamber 19, defined bythe front and rear walls and 21, respectively, of the setting.

A halite construction for directing the gases across the boiler tubes, comprises a roof bafile .22 supported upon the lower bank of tubes 10 and extending 't'orwardly from the headers 18, which are, in turn, sealed against the rear wall 21, and a transverse bdflle 93 extending p ardly from the front end ofthe roof bail'le 22 across the boiler tubes. A second battle 24.- is provided. at the rear ot the battle 23, whichis extended up- \vardly to the headers of the superheater 25 disposed above theboiler tubes, as shown, amleiitends downwardly across only a part of the tubes, in a known manner.

In order to provide means for cooling the soot blowing element, the front end of the root baffle 22 comprises roof pieces 26 forn'led of a material, such as cast iron, havinggood heat conductivity, which pieces are supported on and closely contact with the boiler tubes of the lower bank 10. The transverse baffle 23 comprises a metallic member 27 located at the lower portion thereof and extending across the baflle, as shown in Fig. 3, which, in the form here shown, rests 011 the metallic roof pieces, and which held in position by lugs 26 extending upwardly fromthe roof pieces, the lower face of the member 27 beingbevelled, as shown, to form a close fit with the root pieces. It will be understood, however, that the member 27 may be made integral with the roof pieces 26. The front side of the member 27 is preferably provided with a recess 28, preferably semi-circular. in form, as shown, which is adapted to receive a tubular soot-bl0wing element 29 provided with nozzles 30 extending through its wall, and through which steam is blown to it may be rotated.

. of. Moreover, the soot-blowing element is I protected from the intense heat of the furnace gases flowing upwardly through the first pass across the :tubes by the .roof pieces 26, which extend forwardly beyond the battle 23, and which serve to cut off radiant heat from thesoot-blowing element which is located above the roof pieces.

The front furnace wall 20 is preferably provided with an opening 33 adjacent to the lower tubes and closed by a door 34 which affords access for the removal of any slag or, other deposit which may form on the tubes, and particularly the lower ones,

where slag is most likely to form.

In Figs. 4 and 5, in which similar parts are -,indicated .by similar reference characters, but with the letter a annexed, I have shown a modified form of my invention.

The member 27 is here provided with an opening 28, the lower part 35 of which is preferably circular in form, and of greater radius than the soot-blowing element 29 which is seated therein, the soot-blowing element in this case directly engaging the wall of the opening 35. The recess 35 is 'made of a greater radius than the sootblowing element in order that any slight irregularities in the latter will not cause it to bind while being-turned.

In the form of my invention shown in Figs. 6 to 8, the member protecting the sootblowing elementis provided with a recess or opening 28 preferably circular in form,

adapted to receive the. soot-blowing element 29, the walls of the protecting member partially enclosing said element. The opening 28" is preferably substantially larger than the tube of the soot-blowing element 29, in

2 order that any-warping of the latter may of the opening, as indicated. The

not causethe same to bind within the passage, and the tube of the element is preferablyv seated on the walls at the bottom rotecting member 27 is here shown-as lntegra'l with the base plate 26 which .isseated upon and is in good thermal engagement with boiler tubes. The protecting members are preferably made in two sections for a single spacehbetween two of the boiler tubes, as

best shown in Fig.7. As stated, the walls of the protecting member are formed to enclose, partially the soot-blowing element,

' and in the specific embodiment of my inventionhere shown, blocks v36 are provided which are preferably notched at one corner, as at 37, to engage a rib or raised portion 38 on the base 26", in order to hold the blocks securely in position. The blocks 86 are formed with a concave surface, at 35), which completes the cylindrical part of the recess or opening 28, the top of the blocks forming a tight fit, as at 40, with the wall of the member 27 above the recess. The upper and lower walls of that portion of the recess 41 (See Fig. 6) between two blocks are preferably flared, as indicated at 4-2. Tiles 48 are preferably laid on the tubes in front of the base part 26 of the protecting member. The centers of the nozzles 30 of the soot-blowing element 29 are preferably opposite the centers of those parts of the recesses formed between the blocks 36 when the soot-blowing elen'ient is in its normal position.

The removable blocks 36 which come in front of the protecting member 27" may he made integral with the protecting member 27. When this is done, the soot-blowing element must be introduced from the sides of the setting, whereas with the blocks 36 made removable, it may be placed in position by introducing it into the furnace, and after passing one end through the side wall, laying it in place in the recess or opening 28' It is advantageous in most cases to introduce the soot-blowing element into the furnace and then lay it in place in the recess or opening 28, as the aisle room between boilers is usually insutlicient for introducing the complete element direetl y from the side of the boiler into the recess or opening 28. \Vhere the blocks 36 are made integral with the protecting members 27*, it would usually be necessary to divide the soot-blowing element into several pieces in order that it might be introduced in lengths short enough to be handled in the aisle width, and this would make it necessary to employ joints in the soot-blowing element, which are objectionable.

Preferably, half 01' more of the entire length of the soot-blower pipes come inside and are completely surrounded by cast iron, or other good heat conducting material, which forms a shield for the soot-blowing element. Any heat absorbed through radiation for that part of the soot-blowing element which is not completely surrounded by the protecting member, is conducted away to the protecting member, and the soot blowers are thereby prevented from being overheated.

lVhat I claim and desire to secure by Letters Patent of the United States is:

1. In a steam boiler having horizontally extending water tubes and a furnace below the same, means for directing the furnace gases upwardly across the horizontally extending water tubes, a metallic member located in the lower portion of the upward transverse pass, said member lying on the upper surface of a lower row of water tubes and having extended surfaces in good thermal contact with said tubes, and a rotatable soot blower in close and extended thermal engagement with said metallic member whereby the water in said tubes prevents overheating of the soot blower.

2. In a steam boiler having horizontally extending water tubes, an angle baitlelying over certain of the water tubes and having its upward projection extending across the water tubes, a metallic member located in the lower portion of the first transverse pass of the gases, said member lying on the tops of water tubes and having extended surfaces in good thermal contact therewith, and a rotatable soot blower having a good and extended thermal engagement with said metallic member whereby the water in said tubes prevents overheating of the soot blower.

3. In a steam boiler comprising horizontally extending water tubes, means comprising a baffle for directing the furnace gases in transverse passes across the boiler tubes, a metallic member associated with the lower portion of said battle and in thermal. contact with boiler tubes, and a rotatable soot-blowing element comprising nozzles located in the first transverse pass and in thermal engagement with said metallic member, a metallic barrier in contact with boiler tubes being interposed in front of said. element as regards the flow of the gases whereby said element is shielded from the gases, the parts being constructed and arranged to cause the fluid issuing from said nozzles to sweep theportions of the tubes in the first pass.

4. In a steam boiler comprising horizontally extending water tubes divided into an upper and a lower bank spaced apart, means comprising a bafiie for directing the gases in transverse passes across the boiler tubes, the lower part of said baffle having a metallic portion in thermal contact with boiler tubes, and a rotatable soot-blowing element comprising nozzles located in the first pass and between the two banks of tubes and in thermal engagement with said metallic portion of the battle, the parts being constructed and arranged to cause the fluid issuing from said nozzles during the rotation of the element to sweep the portions of the upper and lower banks of tubes located in the first pass.

5. In a steam boiler comprising horizontally extending water tubes divided into an upper and a lower bank spaced apart, means comprising a battle for directing the gases in transverse passes across the boiler tubes, the lower part of said baffle having a metallic portion in thermal contact with boiler tubes, and a rotatable soot-blowing element comprising nozzles located in the first pass and between the two banks of tubes and in thermal engagement with said metallic portion of the battle, a metallic barrier being laid upon tubes of the lower bank and in front of saidelement as regards the low of gases whereby said element is shielded from said gases, the parts being cmistructed and arranged to cause the fluid issuing from said nozzles during the rotation of the element to sweep the portions oi the uppe." and lower banks of tubes located in the lirstpass.

6. In a steam boiler having horizontally extending water tubes, an angle ballie located above certain of the tubes and having its upwardly extending portion crossing the tubes, a metallic member placed on top of certain of the water tubes and incorporated in the baflie structure near its corner, the metallic member having extended surfaces in good thermal contact with the water tubes on which it lies, and a rotatable soot blower in extended and good thermal engagement with said metallic member whereby the water in saidtubes prevents overheating of the soot blower.

7. In a water tube boiler, a nozzled rotary soot-blower element extending across a row of water tubes in the path of gases flowing across the tubes, and a metallic barrier extending parallel with the blower elementthroughout its length and having good. thermal engagement with the water tubes, said barrier having a longitudinal opening to receive said element and of sufiicient diameter to permit the element to be rotated, and the walls of said barrier having openings opposite the nozzles of said element, said barrier having a portion thereof located to prevent direct impingement of the element by the gr ses flowing past the element.

8. In a water tube boiler, a nozzled rotary soot-blower element extending across a row of water tubes exposed to the radiant heat of the boiler furnace, and a metallic barrier extending parallel with the blower element throughout its length, said barrier being exposed to the radiant heat of the furnace and having good thermal engagement with the water tubes, said barrier having an opening throughout its length to receive said element and of sufiicient diameter to permit the element to be rotated, and the walls of said barrier having openings opposite the nozzles of said element and in a part of the barrier other than that struck by the radiant heat rays.

9. In a water tube boiler, a nozzled rotary so0t-blower element extending across a row of water tubes in the path of gases flowing across the tubes and a metallic barrier extending parallel with the blower element throughout its length and having good thermal engagement with the water tubes, said barrier having a longitudinal opening to receive said element and of sufficient diameter to permit the element to be rotated, and the walls of said barrier having openings opposite the nozzles of said element, the blower element being supported by and in contact with the Walls of said longitudinal opening, and saidcarrier having a portion thereof located to prevent direct impingement of the element'by the gases flowing past the element.

10. In a water tube boiler, a metallic barrier comprising a plurality of metallic pieces arranged end to end across the boiler in the path of gases flowing across the tubes, each of said pieces having relatively long surfaces extending longitudinally of the Water tubes and contacting throughout their length with one or more of the, water tubes, and a nozzled rotary sootblower element extending parallel with said barrier and supported and surrounded thereby to be rotatable therein, with elongated openings in said barrierropposite the nozzles of the element and permitting the projection of jets from the blower nozzles as the element is moved, said barrier having at least portions thereof located to prevent direct impingement of the in said space, and detachable caps extending over said element and arranged to permit said element to be rotated in said space, said caps being thermally connected to said pieces and having spaces between them 0)1)()Sit0, the nozzles of said element, and said i directimpingement of the element by the gases flowing past the element.

DAVID S. JACOBUS.

)arrier having a portion thereof located to prevent- 

